Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-02-04
Phys.Scripta 74 (2006) 77-103
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTEX4, 55 pages
Scientific paper
The damping rate \gamma_t(p) of on-shell transverse gluons with ultrasoft momentum p is calculated in the context of next-to-leading-order hard-thermal-loop-summed perturbation of high-temperature QCD. It is obtained in an expansion to second order in p. The first coefficient is recovered but that of order p^2 is found divergent in the infrared. Divergences from light-like momenta do also occur but are circumvented. Our result and method are critically discussed, particularly regarding a Ward identity obtained in the literature. When enforcing the equality between \gamma_t(0) and \gamma_l(0), a rough estimate of the magnetic mass is obtained. Carrying a similar calculation in the context of scalar quantum electrodynamics shows that the early ultrasoft-momentum expansion we make has little to do with the infrared sensitivity of the result.
Abada Abdellatif
Azi O.
Bouakaz K.
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